“I hope you have the best birthday, Ky!” Kendall wrote on her website along with a collection of photos of the duo. “I can’t believe my little sister is officially not a teenager. We’ve had so many amazing memories over all the years. I love you!”

“Happy birthday, Kylie!” Khloe shared on her own website along with a video tribute. “I cannot believe my youngest sister is turning 20! I’m so impressed by you and how much you’ve already accomplished. You’re such a little mogul. I love you!!!”